Thread: Zero voltage knee press emergency stop

I bought a few of these NVR switches. They work well but do need wiring in to the machine.
The E-Stop mechanism isn't as good as the ones the Homann Design sell in that it needs to turn less than 90 degree to release.

Farther to my earlier post my Triton WC2000 does not have no volt protection, it was sold on the Australian market so our 'nanny state' does not necessary protect us the most-est.
I am not sure but I think the ones with the plug and socket hanging out the side of the switch may be the ones with no volt relays. Another thing with the work centre, you lose the dynamic breaking when you do not use the trigger on saws and routers.
Add Project Lighting, Belconnen to rwbuild,s list.
Regards

I had a paddle type "off switch" on a table saw many years ago but I eventually removed because I kept bumping it and it became a real nuisance.
These days I prefer the round latching type emergency switches.

I got this one from Electus but they are cheaper on bay.
I still keep bumping into them but not as often as with the paddle switch

How about fitting a contactor or relay to the switch? Coil is energised initially via a momentary contact pushbutton switch, remains energised via the current through the contacts. On a zero volts situation the relay clicks open and stays that way till the coil is re-energised by the pushbutton switch???

No volt release.jpg

Schematic pinched from Model Engineer when I was seeing if anyone else had had this idea...

Originally Posted by Master Splinter

How about fitting a contactor or relay to the switch? Coil is energised initially via a momentary contact pushbutton switch, remains energised via the current through the contacts. On a zero volts situation the relay clicks open and stays that way till the coil is re-energised by the pushbutton switch???

As most folks here will know i'm up for most DIY even for its own sake but when these 15A NV switches cost $13 delivered from ebay why would anyone bother?
JCZ3B AC 230V 15A 18A SPST I O Start UP Motor Momentary Electromagnetic Switch | eBay
These are the same switches fitted to most Asian budget level machines.

The quality Schiender version of the same thing from RS costs $35 and I do use these on really critical stuff (like my mains gas powered forge) which could do some serious damage if it were to fail.

You are stuck between a hard place and a rock because large paddle switches are farely rare in Oz and are normally not NVR regardless of location. Alternatively we have push button NVR's without paddles, and latching Estops without paddles that are not NVR. The Axminster unit is an NVR with a latching punch stop function to work as an estop, but you need to release and lift the Estopto to access the Start switch which is not aways convenient if you are juggling a large piece of material in preperation of machining it once you get the machine working.

I think your best outcome for a locally rated unit is to start with BS's Timbercon unit or similar (product search link), and make a housing unit and paddle to suit. Make the paddle whatever size you wish and top hinge it to the housing so it hangs in front of the NVR. Machine an opening through the paddle to allow finger access to the Start button, and place a spacer block on the back of the paddle to bridge the gap between the paddle and the Stop switch so they are in light contact. Should work like a dream, with a large and sensitive paddle, full NVR functionality, and no wiring involvement. This concept was a tip in one of the US mags some time ago.

Originally Posted by BobL

As most folks here will know i'm up for most DIY even for its own sake but when these 15A NV switches cost $13 delivered from ebay why would anyone bother?
JCZ3B AC 230V 15A 18A SPST I O Start UP Motor Momentary Electromagnetic Switch | eBay
These are the same switches fitted to most Asian budget level machines.

The quality Schiender version of the same thing from RS costs $35 and I do use these on really critical stuff (like my mains gas powered forge) which could do some serious damage if it were to fail.

And it would not be difficult for most of us to remove the existing cover off that switch and replace it with a paddle that can be hit with the knee as per the original request. I might even grab a couple of them myself.

Cheers

Doug

Its not a paddle but Professional Woodworking supplies have this one ProRouter Table Switches

Thanks to all for assistance.

I think we very firmly answered the question that Australia is definitively quite backwards in providing to consumer demand. Shamefully for us, these things are readily available in other countries in a dozens variations. Perhaps our over zealous bureaucrats and rent-seeking monopolist electrical unions have stopped low cost consumer items from being available.

After all, why make available a plug in consumer option for $20 when you can gouge hundreds for an electrician-only hard wired "solution".

Perhaps I'm wrong and the demand is actually zero. Either way, I think we all loose.

TotalTools came back with $67.50 per item as a part for the 12m10a table saw, but a 6 weeks wait... Very slow boat.... Though points to them for actually getting back to me. Every other company has failed to do so. Is business struggling here? Well, perhaps they can look at sales for the reason they can't sell.

Malb, and others, had the best suggestion with getting a switch and making a paddle. This was my first thought as I'd also seen it in a few mags and elsewhere....I was just hoping for a more plug-in-and-go type of option.

So, once again defeated! I'm hardly about to move to the USA, but By Zeus I wish our companies possessed the same zeal in proving customer service.

Hong Kong gets the business and AGAIN Australian business fails to secure the sale. What a sad outcome.

I am also looking for the same type of switch for my router table that I am in the process of building so I am quite interested in the replies for clues as to where to look for the best option's. Again in Australia we suffer the tyranny small population,so small market,so we get neglected in the range of product that suppliers are prepared to stock and get the left over's of products dumped on us when a new product arrives on the world market. This is where the mother of invention came to the fore in our engineering manufacturing industry that produced so many excellent machines and product's (all spare parts were many thousands of miles away and took months to reach us) so we made our own and adapted others to suit our need's and now that we are loosing our manufacturing industry look's like not much has changed. So I guess we will have to produce one from what is available.
Regards Rod.